no. 3
On diophantine equations involving sums of powers with quadratic characters as coefficients, I
Compositio Mathematica, Tome 92 (1994) no. 3, pp. 249-271.
partie suivante On diophantine equations involving sums of powers with quadratic characters as coefficients, II 
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     number = {3},
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     mrnumber = {1286126},
     zbl = {0810.11017},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1994__92_3_249_0/}
}
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Urbanowicz, Jerzy. On diophantine equations involving sums of powers with quadratic characters as coefficients, I. Compositio Mathematica, Tome 92 (1994) no. 3, pp. 249-271. http://archive.numdam.org/item/CM_1994__92_3_249_0/

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